Why did the British change strategies in the south?

The British switched to the Southern Strategy in the Revolutionary War because of a lack of success in the north, their belief that the south was full of Loyalists, and their belief that the threat of slave rebellion made southern revolutionaries unable to mount a resistance.

Explanation:

British had some important military successes in the South. They occupied Savannah, Georgia, in late 1778 and Charleston, South Carolina, in May 1779. They also struck a disastrous blow on General Horatio Gates' forces at Camden, South Carolina, in August 1780.

Although the British were successful in most conventional battles, the fighting in the South, under the leadership of Generals Nathanael Greene and Daniel Morgan, turned toward guerrilla and hit-and-run warfare. Moreover, the British had overestimated loyalist sentiment in the South; their presence actually forced many, who had been sitting out the war, to take sides, most in favor of the Patriots. At the same time, the British underestimated the logistical problems they would encounter, especially when their army was in the interior away from the supplies offered by their fleet. Patriot forces, on the other hand, were supplied and could hide among the local population. As a result, the British southern strategy was a dismal failure.

the amount of the purse is, $120.

tax rate =9%

first find the the total tax she paid on the amount is equal to the 9% of $120 i.e,

now,

total amount paid by shalika = $120 +$10.8 = $130.8